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c# 利用AForge.NET组件操作摄像头
AForge.NET是一个专门为开发者和研究者基于C#框架设计的,这个框架提供了不同的类库和关于类库的资源,还有很多应用程序例子,包括计算机视觉与人工智能,图像处理,神经网络,遗传算法,机器学习,机器人等领域。
根据网上的方法,运行程序摄像头出来了,但是怎么截图呢?找到一个显示图片方法如下
[csharp] view plaincopyprint?
- private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
- {
- Bitmap img = (Bitmap)eventArgs.Frame.Clone();
- //do processing here
- pictureBox1.Image = img;
- }
开始参考这句代码写了:
[csharp] view plaincopyprint?
- private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
- {
- Bitmap img = (Bitmap)eventArgs.Frame.Clone();
- string imgPath = dirc + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
- img.Save(imgPath);
- }
但是点击截图程序就自动不停截了大量的图片,最后导致程序出问题。想了一个笨方法,可以只截一次图:
[csharp] view plaincopyprint?
- private int flag = 1;
- /// <summary>
- /// 截图
- /// </summary>
- private void toolStripButton3_Click(object sender, EventArgs e)
- {
- flag = 0;
- videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
- }
- private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
- {
- Bitmap bitmap = (Bitmap)eventArgs.Frame.Clone();
- if (flag == 0)
- {
- string img = dirc + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
- bitmap.Save(img);
- flag = 1;
- }
- }
完整的程序代码如下:
[csharp] view plaincopyprint?
- using System;
- using System.Collections.Generic;
- using System.ComponentModel;
- using System.Data;
- using System.Drawing;
- using System.Drawing.Imaging;
- using System.Text;
- using System.Windows.Forms;
- using System.IO;
- using AForge;
- using AForge.Video;
- using AForge.Video.DirectShow;
- using AForge.Imaging;
- using AForge.Imaging.Filters;
- namespace Camera
- {
- public partial class Form1 : Form
- {
- private FilterInfoCollection videoDevices;
- private VideoCaptureDevice videoSource;
- private int flag = 1;
- private string dirc = System.AppDomain.CurrentDomain.BaseDirectory + "Images"; //截图保存的目录
- public Form1()
- {
- InitializeComponent();
- }
- private void Form1_Load(object sender, EventArgs e)
- {
- if (!Directory.Exists(dirc))
- Directory.CreateDirectory(dirc);
- try
- {
- // 枚举所有视频输入设备
- videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
- if (videoDevices.Count == 0)
- throw new ApplicationException();
- foreach (FilterInfo device in videoDevices)
- {
- tscbxCameras.Items.Add(device.Name);
- }
- tscbxCameras.SelectedIndex = 0;
- }
- catch (ApplicationException)
- {
- tscbxCameras.Items.Add("No local capture devices");
- videoDevices = null;
- }
- }
- private void toolStripButton1_Click(object sender, EventArgs e)
- {
- CameraConn();
- }
- /// <summary>
- /// 连接开启摄像头
- /// </summary>
- private void CameraConn()
- {
- videoSource = new VideoCaptureDevice(videoDevices[tscbxCameras.SelectedIndex].MonikerString);
- videoSource.DesiredFrameSize = new Size(500, 300);
- videoSource.DesiredFrameRate = 1;
- videPlayer.VideoSource = videoSource;
- videPlayer.Start();
- }
- /// <summary>
- /// 关闭摄像头
- /// </summary>
- private void toolStripButton2_Click(object sender, EventArgs e)
- {
- videPlayer.SignalToStop();
- videPlayer.WaitForStop();
- }
- private void Form1_FormClosing(object sender, FormClosingEventArgs e)
- {
- toolStripButton2_Click(null, null);
- }
- /// <summary>
- /// 截图
- /// </summary>
- private void toolStripButton3_Click(object sender, EventArgs e)
- {
- flag = 0;
- videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
- }
- private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
- {
- Bitmap bitmap = (Bitmap)eventArgs.Frame.Clone();
- if (flag == 0)
- {
- string img = dirc + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
- bitmap.Save(img);
- flag = 1;
- }
- }
- }
- }
界面效果如下:
c# 利用AForge.NET组件操作摄像头
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